(6)
Pressurize auxiliary pitot systems No. 1 to between 2.40 and 2.50 psig (16.55 and 17.24 kPa) (314 to 317 knots) (AMM 34-11-00/201).
NOTE: Use airspeed values only when the static pressure on the
____
airspeed indicator is open to ambient pressure.
S 725-012
(7) Do the steps that follow to make sure that autopilot hardover operates correctly with only auxiliary pitot system No. 1 pressurized:
NOTE: Repeat the test steps below for each of the autopilot
____
servos.
(a)
Cycle the control column full forward and full aft and then back to neutral.
(b)
Shake the control column lightly to center the elevator system.
(c)
Move the ENGAGE switch to ON.
(d)
Move the DIRECTION switch to UP.
(e)
Measure the distance that the left elevator trailing edge moved from the neutral position mark on the tape.
(f)
Make sure that the distance is between 0.60 and 1.11 inches
(15.2 and 28.2 mm).
(g)
Move the DIRECTION switch to OFF.
(h)
Move the ENGAGE switch to OFF.
(i)
Cycle the control column full forward and full aft and then back to neutral.
(j)
Shake the control column lightly to center the elevator system.
(k)
Move the ENGAGE switch to ON.
(l)
Move the DIRECTION switch to DOWN.
(m)
Measure the distance that the left elevator trailing edge moved from the neutral position mark on the tape.
(n)
Make sure that the distance is between 0.70 and 1.10 inches
(17.8 and 27.9 mm).
(o)
Move the DIRECTION switch to OFF.
(p)
Move the ENGAGE switch to OFF.
(q)
Repeat the steps above to test each of the autopilot servos.
S 865-159
(8) Remove the pressure from auxiliary pitot system No. 1 (AMM 34-11-00/201).
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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MAINTENANCE MANUAL
S 725-013
(9) Do the steps that follow to make sure that autopilot hardover operates correctly with auxiliary pitot systems No. 1 and 2 not pressurized:
NOTE: Repeat the test steps below for each of the autopilot
____
servos.
(a) Move the horizontal stabilizer until dimension B on the stabilizer ballscrew actuator is 15.89 | 0.01 inches
(403.6 | 0.3 mm) (Fig. 502).
(b)
Cycle the control column full forward and full aft and then back to neutral.
(c)
Shake the control column lightly to center the elevator system.
(d)
Mark the neutral position on the tape.
(e)
Move the ENGAGE switch to ON.
(f)
Move the DIRECTION switch to UP.
(g)
Measure the distance that the left trailing edge moved from the neutral position mark on the tape.
(h)
Make sure that the distance is between 4.90 and 6.90 inches
(124.5 and 175.3 mm).
(i)
Move the DIRECTION switch to OFF.
(j)
Move the ENGAGE switch to OFF.
(k)
Cycle the control column full forward and full aft and then back to neutral.
(l)
Shake the control column lightly to center the elevator system.
(m)
Move the ENGAGE switch to ON.
(n)
Move the DIRECTION switch to DOWN.
(o)
Measure the distance that the left trailing edge moved from the neutral position mark on the tape.
(p)
Make sure that the distance is between 5.00 and 8.35 inches
(127.0 and 212.1 mm).
(q)
Move the DIRECTION switch to OFF.
(r)
Move the ENGAGE switch to OFF.
(s)
Repeat the steps above to test each of the autopilot servos.
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